Putting a reg on the tank

Hello, I just got a cp 45/45 tank in the mail and I was wondering if hand tight would be okay ? This is my first tank that i would be putting the reg on myself. I just don't want to fill it up tomorrow and it blows on me.

Hand tight is in fact, not safe. Not with screw in systems at least. The original Max-flo is a different mounting system. If your threads bind into your asa or you cross thread it, even with air in the cylinder the reg can still unscrew.
Also the way your reg sits right now is not correct. You do not want any gap between your cylinder and regulator. That gives room for the o-ring that is supposed to seal between the reg and tank cylinder to blow out.
You need to crank that down more. If you are having trouble take it to your field/shop and have them tighten it down.
As it sits I would not even attempt to fill it.

Hand tight is in fact, not safe. Not with screw in systems at least. .

Sorry, but b.s. All tank regs have slots or holes toward the bottom of the thread so they won't violently spin or shoot off under pressure. The pressure actually pushes the reg in tight and works perfectly fine. If you ever fly with a tank it's really the only choice you have (so they can see inside your tank for inspections).

So a tank reg that is not properly fastened so it may potentially unscrew to the point of having to utilize it's bleed features, is safe and acceptable?
Agreed though that if you fly and are removing your regulator on a regular basis things are slightly different. However if you are traveling to large events there are tech booths where the manufacturers will secure and then can remove the regulator for you prior to you leaving should you need them too. I should have mentioned that though the vast majority of players are not traveling with their tanks on a regular basis.
The fact of the matter is, in this post, that hand tight is in fact not safe as the regulator is not seated properly. There is a very large and noticeable gap going by hand tight. The system is not currently safe to use in it's current state. It needs to be tightened further.